What can an SHBG test tell you?
An SHBG test doesn’t diagnose a specific condition, but it helps clarify what’s going on with your hormone balance, particularly when total testosterone doesn’t match your symptoms and how you feel.
For example, someone may have a normal total testosterone level on paper but still experience symptoms of low testosterone if their SHBG is high. That’s because more of their testosterone is “bound” to SHBG, leaving less available for T cells to use.
In men, SHBG testing can help evaluate:
Providers often use SHBG values along with total testosterone and albumin levels to calculate free testosterone, a more accurate indicator of active hormone status.
What is being tested?
The SHBG test measures how much of the SHBG protein is present in the blood.
SHBG binds tightly to testosterone and estradiol, keeping most of these hormones “inactive” while they circulate. Only the 2–3 percent of total testosterone that circulates freely can enter cells and exert effects on tissues such as muscle, bone, and reproductive organs.
Because SHBG influences how much of the hormones remain free and available, it plays a central role in maintaining healthy androgen balance. Abnormal SHBG levels can limit testosterone’s effects and potentially signal underlying endocrine or metabolic disorders.
Where is the SHBG test typically included?
The SHBG test isn’t part of standard metabolic panels. Instead, it’s usually included in a male hormone panel or testosterone evaluation that may also measure:
Total testosterone
Free or bioavailable testosterone
Estradiol (E2)
Albumin
Luteinizing hormone (LH) and follicle-stimulating hormone (FSH)
Thyroid function tests (TSH, free T4)
This combination gives providers a more complete view of how your endocrine system is functioning and helps identify whether symptoms stem from testicular, pituitary, or systemic causes.
Who should get an SHBG test?
Providers may recommend an SHBG test for men who have symptoms or risk factors suggesting hormone imbalance, especially when total testosterone results don’t seem to tell the full story and don’t match how you feel.
Common symptoms of hypogonadism that may prompt testing include:
Low libido or erectile dysfunction
Fatigue or loss of energy
Decreased muscle mass or strength
Mood changes, irritability, or depression
Difficulty concentrating
Infertility or reduced sperm count
Decreased body hair or changes in body composition
The Endocrine Society recommends considering SHBG testing in men whose total testosterone results don’t align with clinical symptoms or when conditions that affect SHBG production are suspected.
